JPS62121168U

JPS62121168U -

Info

Publication number: JPS62121168U
Application number: JP1986007742U
Authority: JP
Priority date: 1986-01-24
Filing date: 1986-01-24
Publication date: 1987-07-31

Description

[Brief explanation of drawings]

第１図は本考案に係わる油圧シリンダのシール
装置の一実施例の概略を示す縦断側面図、第２図
は一方の補助シールを第４図の矢視―線に沿
つて示す縦断側面図、第３図は他方の補助シール
を第４図の矢視―線に沿つて示す縦断側面図
、第４図は同各補助シールを第２，３図の矢視
―線に沿つて示す正面図、第５図は一方の補助
シールの一部を拡大して示す縦断側面図、第６図
は他方の補助シールの一部を拡大して示す縦断側
面図、第７図はダストシールを示す縦断側面図、
第３図は従来のオイルシールを示す縦断側面図で
ある。８…シリンダ、８ａ…ピストン、８ｂ…ピスト
ンロツド、８ｃ，８ｄ…シリンダ８の両端部、１
５…オイルシール、１６，１６′…補助シール、
１６ａ，１６ｂ，１６ｃ，１６ｅまたは１６ｈ…
油路、１６ｄ…チヤンバー。 FIG. 1 is a longitudinal side view schematically showing an embodiment of a sealing device for a hydraulic cylinder according to the present invention, FIG. 2 is a longitudinal side view showing one auxiliary seal along the arrow line in FIG. 4, Fig. 3 is a longitudinal side view showing the other auxiliary seal along the arrow line in Fig. 4, and Fig. 4 is a front view showing each of the auxiliary seals along the arrow line in Figs. 2 and 3. , FIG. 5 is a longitudinal side view showing an enlarged part of one of the auxiliary seals, FIG. 6 is a longitudinal side view showing an enlarged part of the other auxiliary seal, and FIG. 7 is a longitudinal side view showing the dust seal. figure,
FIG. 3 is a longitudinal side view showing a conventional oil seal. 8... Cylinder, 8a... Piston, 8b... Piston rod, 8c, 8d... Both ends of cylinder 8, 1
5...Oil seal, 16,16'...Auxiliary seal,
16a, 16b, 16c, 16e or 16h...
Oil road, 16d...chamber.

Claims

[Scope of utility model registration request]

In a sealing device for a hydraulic cylinder in which both ends of a cylinder and a piston rod passing through the ends are sealed by oil seals installed inside the ends, an auxiliary seal that contacts the outer circumferential surface of the piston rod; an annular chamber that opens toward the outer circumferential surface of the piston rod is formed between the auxiliary seal and the oil seal;
A sealing device for a hydraulic cylinder, characterized in that the inside of the chamber and the hydraulic chamber of the cylinder are connected by an oil passage with a small cross-sectional area provided in the auxiliary seal or the oil seal.